/Engine/Plugins/Experimental/GeometryScripting/Source/GeometryScriptingCore/Public/GeometryScript/MeshBasicEditFunctions.h
Removes specified triangles, identified by mesh selection, from the mesh. On return, NumDeleted will contain the actual number of triangles removed.
static [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * DeleteSelectedTrianglesFromMesh ( [UDynamicMesh](API\Runtime\GeometryFramework\UDynamicMesh) * TargetMesh, [FGeometryScriptMeshSelection](API\Plugins\GeometryScriptingCore\GeometryScript\FGeometryScriptMeshSelection) Selection, int & NumDeleted, bool bDeferChangeNotifications )